Qualification > Sciences
Edexcel BIOLOGY Doubts!!!!
Malak:
Yeah, I understand now :d
Thanks
Malak:
Another doubt.
What actually is the acute phase of HIV.
I am confused, does it happen after HIV virus has binded with the host cell and all the viral dna thing has taken place? :S
MKh:
--- Quote from: Ang3l on January 18, 2012, 06:22:24 pm ---Another doubt.
What actually is the acute phase of HIV.
I am confused, does it happen after HIV virus has binded with the host cell and all the viral dna thing has taken place? :S
--- End quote ---
The acute phase of HIV infection is when the Human Immunodeficiency Virus has infected the host cell. Actually viruses need to bond to a host cell inorder to reproduce; before this they cannot reproduce - all viruses depend on a host cell inorder to replicate themselves.
The acute phase of HIV infection is the first phase of HIV infection which is called the primary HIV infection phase
1. The primary HIV infection phase (or acute sero-conversion illness)Graphic, Phase 1.
The acute phase of HIV infection (also called acute sero-conversion illness) begins as soon as sero-conversion has taken place. Sero-conversion means the point in time when a person’s HIV status converts or changes from being HIV negative to HIV positive. This also usually coincides with the time when an HIV antibody test will show that a person is HIV positive.
Sero-conversion usually occurs four to eight weeks after an individual has been infected with the HI virus. About 30%-60% of people infected with HIV develop flu-like symptoms such as sore throat, headache, mild fever, fatigue, muscle and joint pains, swelling of the lymph nodes, rash, and (occasionally) oral ulcers. These symptoms usually last from between one and two weeks.
Because of the rapid replication of the virus, the HIV viral load is usually very high during the acute phase. Immediate and aggressive treatment with anti-retroviral therapy (ART) at this stage may be effective in reducing the viral load to undetectable levels, or even in eradicating the virus.
Source: http://www.health.am/aids/more/symptoms_and_phases_of_hiv_infection_aids/
Hope this helps.
Malak:
^Thanks.
Sometimes in questions, they ask us to give an example of an organism and its habitat.
Can someone name some for me with their habitat.
Thanks. *i think i will fail* >_<
MKh:
^Ohh don't be put off by the amount of information i have linked you to, it's simply to help your understanding. I wish i had the opportunity to look onto these sites before my exam to help my understanding, even if it was a day before, because you see the book doesn't tell us the whole thing.
But keep to the specification only. Have you referred to those notes i once uploaded here?
Tips: -Learn the common definitions like gene mutation, allele frequency and some other commonly asked ones - you must have noticed that they are even mentioned in the Edexcel A2 Revision guide. Also see the marking schemes for exact definitions.
-Revise the core practicals very well - the one for measuring the effectiveness of an antibiotic, the PCR and the DNA profiling one --- check the marking schemes. For the other two core practicals - the investigation of ecology and measuring the effect of temperature on growth of seedlings, they might ask some random questions so be prepared by practicing past papers. Also understand their underlying biological principles.
-Check out the Quick questions on your revision guide
-Learn the whole immune system response and evolution topics very well.
And about your question, can you give me a few examples of such questions that you have come across?
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